SerializableMultidimensionalArray

gistfile1.cs

public class SerializableMultidimensionalArray : IXmlSerializable
{
    private readonly int[,] array = new int[3, 2];

    public int this[int i, int j]
    {
        get
        {
            return this.array[i, j];
        }

        set
        {
            this.array[i, j] = value;
        }
    }

    public XmlSchema GetSchema()
    {
        throw new NotSupportedException();
    }

    public void ReadXml(XmlReader reader)
    {
        if (reader.NodeType == XmlNodeType.Element && reader.Name == "SerializableMultidimensionalArray")
        {
            reader.Read();
            while (reader.NodeType == XmlNodeType.Element && reader.Name == "ArrayElement")
            {
                reader.ReadStartElement("ArrayElement");
                int i = reader.ReadElementContentAsInt();
                int j = reader.ReadElementContentAsInt();
                int value = reader.ReadElementContentAsInt();
                reader.ReadEndElement();

                this[i, j] = value;
            }
        }
    }

    public void WriteXml(XmlWriter writer)
    {
        (from i in Enumerable.Range(0, this.array.GetLength(0))
         from j in Enumerable.Range(0, this.array.GetLength(1))
         select new
             {
                 I = i, 
                 J = j, 
                 Value = this[i, j]
             }).ToList()
               .ForEach(e =>
                   {
                       writer.WriteStartElement("ArrayElement");
                       writer.WriteElementString("I", e.I.ToString());
                       writer.WriteElementString("J", e.J.ToString());
                       writer.WriteElementString("Value", e.Value.ToString());
                       writer.WriteEndElement();
                   });
    }
}

public class SerializableMultidimensionalArrayScenario
{
    [Fact]
    public void Sut_ShouldBeSerializableAndDeserializable()
    {
        // Arrange
        var sut = new SerializableMultidimensionalArray();
        sut[1, 1] = 10;
        var sb = new StringBuilder();
        var xmlSerializer = new XmlSerializer(typeof(SerializableMultidimensionalArray));

        // Act & Assert (Serializable)
        xmlSerializer.Serialize(new StringWriter(sb), sut);
        Assert.Contains("<Value>10</Value>", sb.ToString());

        // Act & Assert (Deserializable)
        sut = (SerializableMultidimensionalArray)xmlSerializer.Deserialize(new StringReader(sb.ToString()));
        Assert.Equal(10, sut[1, 1]);
    }
}